Chapter IX

103. Lateral Wind Pressure on Trusses 122
104. Upper and Lower Lateral Bracing 124
105. Bridge Plans and Shopwork 125
106. Erection of Bridges 126
107. Statically Determinate Trusses 126
108. Continuous Beams and Trusses—Theorem of Three Moments 128
109. Application to Draw- or Swing-bridges 130
110. Special Method for Deflection of Trusses 130
111. Application of Method for Deflection of Triangular Frame 133
112. Application of Method for Deflection to Truss 134
113. Method of Least Work 137
114. Application of Method of Least Work to General Problem 138
115. Application of Method of Least Work to Trussed Beam 139
116. Removal of Indetermination by Methods of Least Work
and Deflection 141

CHAPTER X.
117. The Arched Rib, of both Steel and Masonry 142
118. Arched Rib with Ends Fixed 144
119. Arched Rib with Ends Jointed 144
120. Arched Rib with Crown and Ends Jointed 145
121. Relative Stiffness of Arched Ribs 145
122. General Conditions of Analysis of Arched Ribs 146

CHAPTER XI.
123. Beams of Combined Steel and Concrete 149

CHAPTER XII.
124. The Masonry Arch 154
125. Old and New Theories of the Arch 155
126. Stress Conditions in the Arch-ring 158
127. Applications to an Actual Arch 158
128. Intensities of Pressure in the Arch-ring 162
129. Permissible Working Pressures 163
130. Largest Arch Spans 163

CHAPTER XIII.
131. Cantilever and Stiffened Suspension Bridges 166
132. Cantilever Bridges 166
133. Stiffened Suspension Bridges 168
134. The Stiffening Truss 170
135. Location and Arrangement of Stiffening Trusses 171
136. Division of Load between Cables and Stiffening Truss 173
137. Stresses in Cables and Moments and Shears in Trusses 174
138. Thermal Stresses and Moments in Stiffened
Suspension Bridges 175
139. Formation of the Cables 176
140. Economical Limits of Spans 177

PART III.
_WATER-WORKS FOR CITIES AND TOWNS._