Steel Structures II

Course Information

College	Akashi College	Year	2021
Course Title	Steel Structures II
Course Code	0100	Course Category	Specialized / Compulsory
Class Format	Lecture	Credits	School Credit: 1
Department	Civil Engineering	Student Grade	5th
Term	Second Semester	Classes per Week	2
Textbook and/or Teaching Materials	Kuranishi S. and Nakamura S.: Bridge structure (3rd Ed), Morikita Publishing Co., Ltd. (as a designated textbook), Printed synopses of the lecture are distributed as necessary in a class. Nagai M. : Bridge engineering (2nd Ed), Kyoritsu Publishing Co., Ltd. (as a reference)
Instructor	MIYOSHI Takao

Course Objectives

This subject aims to help students understand, explain or calculate as follows:
1. Mechanical properties, structure, type and cross-section constitution of steel girder bridges (D)
2. Design method of steel girder bridges, role of stiffeners, role and structure of lateral bracing and sway bracing (D)
3. Characteristics of arc welding, type and limit value of welded joint (D)
4. Stress calculation of welded joint, limit value calculation and verification of welded joint (D)
5. Method of arc weld, structure of weld portion, weld defect and non-destructive testing (D)
6. Fatigue damage of steel members, S-N curve and fatigue design (D)
7. Mechanism of bolted joints, type and mechanical properties of high strength bolt, limit state, limit value and verification method of high-strength bolted friction joint (D)
8. Bolt spacing and edge distance of high strength bolted friction joint, faying surface treatment and bolt tightening method (D)
9. Calculation of acting forces and limit value in simple high strength bolted friction joint (F)

Rubric

	Ideal Level	Standard Level	Unacceptable Level
Achievement 1	A student who can sufficiently understand and explain mechanical behavior, type, structure and cross-section constitution of steel girder bridges	A student who can understand and explain mechanical behavior, type, structure and cross-section constitution of steel girder bridges	A student who cannot understand and explain mechanical behavior, type, structure and cross-section constitution of steel girder bridges
Achievement 2	A student who can sufficiently understand and explain design method of steel girder bridges, role of stiffeners, role and structure of lateral bracing and sway bracing	A student who can understand and explain design method of steel girder bridges, role of stiffeners, role and structure of lateral bracing and sway bracing	A student who cannot understand and explain design method of steel girder bridges, role of stiffeners, role and structure of lateral bracing and sway bracing
Achievement 3	A student who can sufficiently understand and explain characteristics of arc weld, type and limit value of welded joint	A student who can understand and explain characteristics of arc weld, type and limit value of welded joint	A student who cannot understand and explain characteristics of arc weld, type and limit value of welded joint
Achievement 4	A student who can calculate stress and limit value of simple welded joints and verify its safety without referring design example	A student who can calculate stress and limit value of simple welded joints and verify its safety with referring design example	A student who cannot calculate stress and limit value of simple welded joints and verify its safety with referring design example
Achievement 5	A student who can sufficiently understand and explain method of arc welding, structure of weld portion, weld defect and non-destructive testing	A student who can understand and explain method of arc welding, structure of weld portion, weld defect and non-destructive testing	A student who cannot understand and explain method of arc welding, structure of weld portion, weld defect and non-destructive testing
Achievement 6	A student who can sufficiently understand and explain fatigue damage, S-N curve and fatigue design of steel members	A student who can understand and explain fatigue damage, S-N curve and fatigue design of steel members	A student who cannot understand and explain fatigue damage, S-N curve and fatigue design of steel members
Achievement 7	A student who can sufficiently understand and explain mechanism of bolted joints, type and mechanical properties of high strength bolt, limit state, limit value and verification method of high-strength bolted friction joint	A student who can understand and explain mechanism of bolted joints, type and mechanical properties of high strength bolt, limit state, limit value and verification method of high-strength bolted friction joint	A student who cannot understand and explain mechanism of bolted joints, type and mechanical properties of high strength bolt, limit state, limit value and verification method of high-strength bolted friction joint
Achievement 8	A student who can sufficiently understand and explain bolt spacing and edge distance of high strength bolted friction joint, faying surface treatment and bolt tightening method	A student who can understand and explain bolt spacing and edge distance of high strength bolted friction joint, faying surface treatment and bolt tightening method	A student who cannot understand and explain bolt spacing and edge distance of high strength bolted friction joint, faying surface treatment and bolt tightening method
Achievement 9	A student who can calculate acting forces and limit value of simple high strength bolted friction joints without referring design examples	A student who can acting forces and limit value of simple high strength bolted friction joints with referring design examples	A student who cannot acting forces and limit value of simple high strength bolted friction joints with referring design examples

Assigned Department Objectives

学習・教育到達度目標 (D) （基礎学力と自主的・継続的学習能力）

学習・教育到達度目標 (F) （柔軟かつ創造的な設計能力）

Teaching Method

Outline:

This subject will be conducted followed by Steel structures I, so that students can learn indispensable knowledge for design and maintenance of steel structures. In this subject, a teacher, who has an experience as an engineer of bridge fabricator and has engaged in design of steel bridges and steel structures, will conduct lecture-style class on design and fabrication of welded and bolted joints, weld defect, non-destructive testing method, and evaluation method of fatigue strength, based on his experiences. Also, he will conduct lecture-style class on characteristic, type and structure of steel girder bridges and overview of the design procedure.

Style:

This lecture-style class will include explanation of design examples on welded and bolted joints so that students can deepen understanding of connection structures using welding and high strength bolted friction joint, fatigue strength evaluation method of weld portion, design procedure of steel girders etc. During class, in order to grasp the understanding of each student, teacher may proceed with the class while asking the student questions with regard to structural mechanics and contents which have already been learned in this subject.

Notice:

This class will be proceeded on the premise that students have learned fundamental knowledge of structural mechanics and Steel structure I. In the class, students should try to understand the mechanism of connection structures using welding and high-strength bolts and their design methods, and to be able to conduct design calculation of a simple connection structure. Also, students should try to understand and explain fatigue strength calculation method of welded joints, calculation of design stress and cross-section performance of steel girders.
If the number of absences exceeds more than 33% of total school hours, pass is not accepted.

Characteristics of Class / Division in Learning

Applicable to Remote Class

Instructor Professionally Experienced

Course Plan

			Theme	Goals
2nd Semester
	3rd Quarter
		1st	Steel girder bridge (1) Mechanism and structural type of the plate girder, box girder, torsion coefficient and shear lag of the girder will be explained.	Students can understand mechanism and structural type of the plate girder, box girder, torsion coefficient and shear lag of the girder.
		2nd	Steel girder bridge (2) Constitution of the plate girder, shear buckling of the web, diagonal tension field, design calculation to determine girder height, web thickness, flange width and thickness will be explained.	Students can understand constitution of the plate girder, shear buckling of the web, diagonal tension field, design calculation to determine girder height, web thickness, flange width and thickness.
		3rd	Steel girder bridge (3) Design and fabrication of stiffeners, design of cross beam, sway bracing and lateral bracing will be explained.	Students can understand design and fabrication of stiffeners, design of cross beam, sway bracing and lateral bracing will be explained.
		4th	Welded joint (1) Welded joints of the steel member, welding method, weld defect and non-destructive testing will be explained.	Students can understand welded joints of the steel member, welding method, weld defect and non-destructive testing.
		5th	Welded joint (2) Type of the welded joint, technical terms used to indicate structure of weld portion, and limit state of the welded joint will be explained.	Students can understand type of the welded joint, technical terms used to indicate structure of weld portion, and limit state of the welded joint.
		6th	Welded joint (3) Stress and limit values calculation methods, verification method of the welded joint subjected to axial force, shear force and bending moment in limit state-1 will be explained.	Students can understand stress and limit values calculation methods, verification method of the welded joint subjected to axial force, shear force and bending moment in limit state-1.
		7th	Welded joint (4) Stress and limit values calculation methods, verification method of the welded joint subjected to axial force, shear force and bending moment in limit state-3 will be explained.	Students can understand stress and limit values calculation methods, verification method of the welded joint subjected to axial force, shear force and bending moment in limit state-3.
		8th	Mid term exam
	4th Quarter
		9th	Fatigue of steel structures Fatigue failure of steel structures, S-N curve and fatigue design of weld portion will be explained.	Students can understand fatigue failure of steel structures, S-N curve and fatigue design of weld portion.
		10th	Bolted joint (1) Outline of high strength bolted joints and type of high strength bolt will be explained.	Students can understand and explain mechanism of high strength bolted friction joint, high strength bolted bearing-type joint and high strength bolted tensile joint, characteristic and type of high strength bolt.
		11th	Bolted joint (2) Limit state and limit value of the high strength bolted friction joint, net cross-sectional area and maximum and minimum bolt spacing will be explained.	Students can understand limit state and limit value of the high strength bolted friction joint. Also, students can calculate net cross-sectional area and maximum and minimum bolt spacing of simple high strength bolted friction joint.
		12th	Bolted joint (3) End distance, bolt tightening force, sliding strength and construction of the high strength bolted friction joint will be explained.	Students can explain maximum and minimum edge distance of the high strength bolted friction joint and why they are specified. Also, students can calculate bolt tightening force and the sliding resistance and explain bolt tightening force controlling method.
		13th	Bolted joint (4) Verification in limit state -1 of the high strength bolt, splice plate and parent plate which are constituted the high strength bolted friction joint will be explained.	Student can calculate design force of a bolt, limit value for sliding, stress and limit values of parent plate and thickness of a splice plate in limit state -1.
		14th	Bolted joint (5) Verification in limit state -3 of the high strength bolt which is constituted the high strength bolted friction joint will be explained.	Student can calculate design force of a bolt and limit value for the shear failure in limit state -3.
		15th	Bolted joint (6) Verification in limit state -3 of splice plate and parent plate which are constituted the high strength bolted friction joint will be explained. Also, design flowchart of the high strength bolted friction joint will be explained.	Students can calculate stress and its limit value of parent plate and verify the safety in limit state-3. Also, student can calculate design force of the bolt and determine the number of the bolt with regard to simple high strength bolted friction joint. Moreover, students can conduct a series of verification in limit state 1 and 3.
		16th	Final exam

Evaluation Method and Weight (%)

	Examination	Behavior	Total
Subtotal	90	10	100
Specialized Proficiency	90	10	100